合成了一系列水溶性2-(2'-芳基磺酰胺基苯基)苯并咪唑衍生物,其含有连接到荧光团π-系统各个位置的供电子和接受基团,并在水溶液中以0.1 M离子强度表征。测得的p K a用于单取代衍生物的磺酰胺基去质子化的α的范围在6.75和9.33之间,并严格遵循Hammett的自由能关系。在中性水性缓冲液中,所有化合物均经历有效的激发态分子内质子转移(ESIPT),以产生光互变异构体产生的强烈的斯托克斯位移荧光发射。在高pH下使磺酰胺氮去质子化后,ESIPT被中断以产生新的蓝移发射带。峰值吸收和发射能量受取代基的性质及其在荧光团π系统上的连接位置的强烈影响。ESIPT互变异构体的荧光量子产率显示出与观察到的斯托克斯位移显着相关。
Vasicine from Adhatoda vasica as an organocatalyst for metal-free Henry reaction and reductive heterocyclization of o-nitroacylbenzenes
作者:Sushila Sharma、Manoranjan Kumar、Vinod Bhatt、Onkar S. Nayal、Maheshwar S. Thakur、Neeraj Kumar、Bikram Singh、Upendra Sharma
DOI:10.1016/j.tetlet.2016.09.095
日期:2016.11
Vasicine, a quinazolinealkaloid, from the leaves of Adhatodavasica, has been utilized as an efficient catalyst for metal and base free Henry reaction of various aldehydes with nitro alkanes. The method can be used in the synthesis of various β-nitro alcohols under mild reaction conditions without use of hazardous organic solvents and expensive catalysts. Vasicine is also applied successfully for
A simple and novel methodology for the synthesis of 3-perfluoroalkylated-2H-indazole derivatives has been elaborated. The perfluoroalkylation of readily available 2-nitrobenzaldimines bearing electron donating groups was performed using the Ruppert-Prakash reagent and its analogues to afford α-difluoromethylated, α-trifluoromethylated and α-pentafluoroethylated benzylamines. A final reductive cyclization
A new type of inhibitor of tubulin polymerization was discovered on the basis of the combretastatin molecular skeleton. The lead compounds in this series, compounds 6 and 7, strongly inhibited tubulin polymerization in vitro and significantly arrested cells at the G(2)/M phase. Compounds 6 and 7 yielded 50- to 100-fold lower IC50 values than did combretastatin A-4 against Colo 205, NUGC3, and HA22T human cancer cell lines as well as similar or greater growth inhibitory activities than did combretastain A-4 against DLD-1, HR, MCF-7, DU145, HONE-1, and MES-SA/DX5 human cancer cell lines. Structure-activity relationship information revealed that introduction of an amino group at the ortho position of the benzophenone ring plays an integral role for increased growth inhibition.
Novel Fused Imidazole Derivative
申请人:Sato Yoshiyuki
公开号:US20080103136A1
公开(公告)日:2008-05-01
The present invention relates to a compound represented by the Formula [I]:
Wherein:
the A ring is a 5-membered aromatic heterocyclic group containing at least one hetero atom selected from a nitrogen atom, and the like; A
1
and A
2
, are each a nitrogen atom, and the like; X
2
, X
3
, X
4
, and X
5
are all carbon atoms, or alternatively any one of X
2
, X
3
, X
4
, and X
5
is a nitrogen atom and the rest are all carbon atoms; R
1
is a hydrogen atom, or the like; R
2
, R
3
, R
4
, and R
5
, are each a hydrogen atom, or the like; R
6
and R
6
′, are each a hydrogen atom, and the like; R
7
is an aryl group and the like; and R
8
is an amino group or a hydroxy group,
or a pharmaceutically acceptable salt or ester thereof.